California has the most amusement parks of any state, and this is its biggest water park. Located on 50 acres, it has over 36 water slides and attractions. Among the most impressive heart-racers is The Bermuda Triangle — one of the fastest water slides in the U.S. at about 50 miles per hour. It has three different courses that whiz riders around at breakneck speed. Another popular ride is The Dark Hole, a water slide that whisks park guests through a dark, watery maze. General admission is $42 per person.